Free Password Strength Checker — Test How Secure Your Password Is

What Is a Password Strength Checker?

A password strength checker is a free online tool that evaluates how secure your password is by analyzing its length, complexity, and resistance to common attack methods. It provides an instant strength rating — from weak to very strong — so you can improve your passwords before using them.

This tool runs entirely in your browser. Your password is never sent to any server — it's analyzed locally on your device for maximum privacy and security.

Why Password Strength Matters

Weak passwords remain the #1 cause of data breaches. According to recent cybersecurity reports, over 80% of hacking-related breaches involve stolen or weak credentials. Here's why strong passwords are critical:

• Brute force protection — A 6-character password can be cracked in seconds; a 16-character password takes centuries
• Credential stuffing defense — Unique, strong passwords prevent attackers from reusing leaked credentials
• Account security — Strong passwords protect email, banking, social media, and cloud accounts
• Regulatory compliance — Many industries require minimum password complexity standards
• Peace of mind — Knowing your passwords are strong reduces anxiety about breaches

How Password Strength Is Measured

Length

The single most important factor. Every additional character exponentially increases the number of possible combinations. Aim for 12-16 characters minimum.

Character Variety

Using a mix of uppercase letters, lowercase letters, numbers, and special characters dramatically increases password entropy — making it harder to crack.

Entropy (Randomness)

Password entropy measures the unpredictability of a password in bits. Higher entropy means more possible combinations. A truly random 12-character password with mixed characters has approximately 79 bits of entropy — effectively uncrackable by brute force.

Common Patterns

The checker detects weak patterns like dictionary words, keyboard sequences (qwerty, 123456), repeated characters (aaa, 111), and common substitutions (p@ssw0rd). These patterns make passwords predictable regardless of length.

How to Use the Password Strength Checker

1. Type or paste your password into the input field above
2. The tool instantly analyzes and displays the strength rating
3. Review the character count and strength indicator
4. If the rating is weak or medium, modify your password using the tips below
5. Re-test until you reach a Strong or Very Strong rating

Tips for Creating Strong Passwords

• Use 14+ characters — Length beats complexity every time
• Mix all character types — Uppercase, lowercase, numbers, and symbols
• Use passphrases — Combine 4-5 random words: "correct-horse-battery-staple" is stronger and easier to remember than "P@ss1"
• Avoid personal info — Never use names, birthdays, or pet names
• Never reuse passwords — Use a unique password for every account
• Use a password manager — Tools like Bitwarden or 1Password generate and store strong passwords
• Enable 2FA — Two-factor authentication adds a second layer of protection

Common Use Cases

• Creating new accounts — Test passwords before signing up for services
• Security audits — Check existing passwords for weaknesses
• IT administrators — Validate password policies meet security standards
• Education — Teach users about password security best practices
• Compliance checks — Verify passwords meet regulatory requirements (HIPAA, PCI-DSS)

Related Tools

Explore more security and utility tools:

• Password Generator — Generate secure random passwords instantly
• MD5 Generator — Create MD5 hashes for text strings
• Bcrypt Generator — Generate bcrypt password hashes
• Base64 Encoder — Encode data in Base64 format
• Safe URL Checker — Verify if a URL is safe to visit

Frequently Asked Questions

Is it safe to type my real password into this tool?

Yes — this tool analyzes your password entirely in your browser. Your password is never transmitted to any server. However, as a general security practice, avoid typing real passwords into any online tool you don't trust.

How long should my password be?

At minimum, use 12 characters. For high-security accounts (email, banking, cloud storage), use 16 or more characters. The longer the better — every additional character makes brute-force attacks exponentially harder.

Are passphrases better than complex passwords?

Yes — a passphrase like "purple-mountain-bicycle-sunset" is both stronger and easier to remember than a short complex password like "P@s5w!" Passphrases work because their length provides high entropy while remaining memorable.

What makes a password "very strong"?

A very strong password typically has 16+ characters, includes all four character types (uppercase, lowercase, numbers, symbols), contains no dictionary words or common patterns, and is completely unique — not reused on any other account.